Thanks, everyone. I have emailed BA and asked for an extension and explained the situation. It is a little complicated. The flights were booked with American and the BA flights were codeshare. Since then, I did have a trip booked to the LA and then LHR through American with BA codeshare flights in April but I canceled them due to the pandemic. American let me cancel those flights and let me rebook through Sep 2021, but I have to book through AA. The vouchers have to be used through BA.
Once I get an email back from BA I'll see what my options are. I appreciate your help and suggestions!